Surface Cleaning Machine and Method for Adjusting the Position of a Sweeping Roller in a Surface Cleaning Machine

ABSTRACT

A surface cleaning machine is provided, including a chassis, at least one sweeping roller which is held on the chassis via a swing arm device, an adjusting device for adjusting a position of the at least one sweeping roller relative to a floor/ground, a sensor device which determines one or more quantities characterizing the relative position of the at least one sweeping roller to the floor/ground, and a control device which controls the relative position of the at least one sweeping roller to the floor/ground, wherein the adjusting device acts on the swing arm device, wherein a position of the at least one sweeping roller relative to the floor/ground is adjusted via a pivotal position of or at the swing arm device, and wherein the sensor device is associated with the swing arm device and detects floor/ground contact of the at least one sweeping roller via the swing arm device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of international application number PCT/EP2013/065528 filed on Jul. 23, 2013, which is incorporated herein by reference in its entirety and for all purposes.

BACKGROUND OF THE INVENTION

The invention relates to a surface cleaning machine, comprising a chassis, at least one sweeping roller which is held on the chassis, an adjusting device for adjusting a position of the at least one sweeping roller relative to a floor/ground to be cleaned, a sensor device which determines one or more quantities characterizing the relative position of the at least one sweeping roller to the floor/ground to be cleaned, and a control device which controls the relative position of the at least one sweeping roller to the floor/ground to be cleaned.

Furthermore, the invention relates to a method for adjusting the position of a sweeping roller in a surface cleaning machine.

WO 2011/09599 A1 discloses a sweeping machine comprising a sweeping brush that is capable of being driven in rotation, a debris container and a suction fan, wherein the suction fan is in flow communication with the sweeping brush via a suction conduit and a suction channel.

EP 0 526 907 B1 discloses an apparatus for adjusting a preselected sweeping pattern width of a roller broom rotatable about an axis for use in cleaning surfaces such as roadways, maneuvering areas of airports, or the like, said apparatus comprising an adjusting device for the distance between the axis and the surface to be cleaned for adjusting the sweeping pattern, wherein a sensor device is provided for detecting the roller diameter, said sensor device comprising a test body capable of being brought into contact with the outer surface of the roller broom, and comprising a measuring and control device which is arranged between the sensor device and the adjusting device and provides a capability of adjusting the sweeping pattern of the roller broom via the adjusting device depending upon the roller diameter. A measuring device is provided for determining the actual distance between the axis and the surface to be cleaned. Furthermore, a control arrangement is provided for comparing the target distance with an actual distance and for generating an adjustment quantity for adjusting the distance of the axis to the target distance.

In a surface cleaning machine and in particular in a sweeping machine, a roller-shaped sweeping roller is brought into contact with the floor/ground. In this connection, the sweeping pattern is the contact area between the sweeping roller and the surface to be cleaned and is a measure of the working area in the sweeping process. Different sweeping patterns may be adequate for different applications.

SUMMARY OF THE INVENTION

In accordance with an embodiment of the invention, a surface cleaning machine is provided that allows the position of the at least one sweeping roller relative to the floor/ground that is to be cleaned to be adjusted in a simple manner.

In accordance with an embodiment of the invention, the surface cleaning machine comprises a chassis, at least one sweeping roller which is held on the chassis, an adjusting device for adjusting a position of the at least one sweeping roller relative to a floor/ground to be cleaned, a sensor device which determines one or more quantities characterizing the relative position of the at least one sweeping roller to the floor/ground to be cleaned, and a control device which controls the relative position of the at least one sweeping roller to the floor/ground to be cleaned, wherein the at least one sweeping roller is held on the chassis via a swing arm device, wherein the adjusting device acts on the swing arm device, wherein a position of the at least one sweeping roller relative to the floor/ground to be cleaned is adjusted via a pivotal position of or at the swing arm device, and wherein the sensor device is associated with the swing arm device and detects floor/ground contact of the at least one sweeping roller via the swing arm device.

In the solution in accordance with the invention, different sweeping patterns can be adjusted in a simple and defined way and can in particular be adjusted automatically. The position of the at least one sweeping roller relative to the floor/ground, and therefore the sweeping pattern, is adjusted via a pivotal position of or at the swing arm device.

The diameter of sweeping rollers varies during use thereof due to wear. Therefore, in principle, for the defined adjustment or maintenance of a sweeping pattern, the current diameter of the at least one sweeping roller should also be detected. In the solution in accordance with the invention, a reaction of the swing arm device is detected via the sensor device upon floor/ground contact of the sweeping roller. This provides a simple way of determining the diameter of the at least one sweeping roller, and this in turn allows for a defined sweeping pattern to be adjusted or maintained even as sweeping roller wear occurs.

The number of adjusting elements and sensors can be minimized. In particular, one adjusting element, provided by the adjusting device, and one sensor element, provided by the sensor device, are sufficient to adjust the sweeping pattern or to adjust different sweeping patterns.

Because the floor/ground contact is determined via a reaction at the swing arm device, the sweeping roller's diameter can be determined in a non-contact manner.

In particular, the at least one sweeping roller is associated with a rotary drive for operation thereof in a sweep mode, in particular wherein an axis of rotation of the at least one sweeping roller is at least approximately parallel to the floor/ground to be cleaned. Effective sweeping is thereby achieved.

In an exemplary embodiment, the at least one sweeping roller is held on the chassis for pivotal motion about a pivot axis, in particular wherein the pivot axis is at least approximately parallel to an axis of rotation of the at least one sweeping roller. The swing arm device effects the pivotable fixing of the at least one sweeping roller to the chassis. By adjusting a certain pivotal position, a height position of the at least one sweeping roller relative to the chassis or relative to the floor/ground can be adjusted in a simple manner, and the sweeping pattern can thereby be adjusted. This provides a simple way of adjusting different sweeping patterns in a defined way and also in an automatic way.

It is advantageous for a sweeping roller housing to be arranged on the chassis, said sweeping roller housing being open towards the floor/ground to be cleaned and having the at least one sweeping roller positioned therein. The sweeping roller housing provides protection to a remaining part of the surface cleaning machine against dirt accumulation. The sweeping roller housing can itself be used for fixing thereto structural parts of a corresponding sweeping roller unit.

In an exemplary embodiment, the adjusting device is fixed to and/or supported on the sweeping roller housing. This results in a compact construction of the corresponding sweeping roller unit.

Provision may be made for the sweeping roller housing to have, at opposing end faces thereof, openings through which articulation elements of the swing arm device extend and hold the at least one sweeping roller. This provides a simple way of having the at least one sweeping roller “protectively” positioned in an interior space of the sweeping roller housing and provides a simple way of positionally adjusting the at least one sweeping roller in a defined manner relative to the floor/ground to be cleaned.

It is advantageous for the adjusting device to comprise an actuator having at least one movable actuator element, said actuator element being articulated to the swing arm device. The actuator is an adjusting element for adjusting a certain height position of the at least one sweeping roller relative to the floor/ground to be cleaned and is therefore an adjusting element for adjusting a sweeping pattern. The actuator effects adjustment of a pivotal position at the swing arm device, or of the swing arm device as a whole. This makes for a construction that uses simple structure.

In particular, it is advantageous for the at least one actuator element to be linearly displaceable. This provides a simple way of adjusting and fixing a pivotal position of the at least one sweeping roller via the swing arm device by use of a linear drive which may for example be a hydraulic drive, a pneumatic drive or an electromotive drive.

Advantageously, the actuator has associated with it a position measuring device which determines a position of the at least one actuator element, in particular wherein the position measuring device is operatively connected for signal communication with the control device. The position measuring device provides a measure of a pivotal position at the swing arm device. This provides a simple way of determining, in conjunction with the sensor device, a current diameter of the at least one sweeping roller, and a defined adjustment of a position of the sweeping roller relative to the chassis can be achieved.

Advantageously, the control device comprises a diameter determining device for the at least one sweeping roller which, by way of a position at the actuator measured by the position measuring device, determines the diameter of the at least one sweeping roller upon floor/ground contact thereof. The floor/ground contact can be detected via the sensor device. If, then, signals provided by the position measuring device upon floor/ground contact are made use of, then the diameter can be determined in a non-contact manner (with respect to sensing of the at least one sweeping roller). This in turn provides for a simple and defined way of adjusting and also maintaining a defined sweeping pattern even during wear of the at least one sweeping roller.

It is advantageous for the control device to comprise an annunciating device which provides an annunciating signal when the determined diameter of the at least one sweeping roller is below a threshold value. In this way, an annunciating signal can be provided to an operator of the surface cleaning machine, alerting him or her that the at least one sweeping roller needs to be replaced.

In an exemplary embodiment that is advantageous in terms of construction, the sensor device comprises or is a switch which provides a switch signal upon floor/ground contact of the at least one sweeping roller. This provides a simple way of determining the diameter of the at least one sweeping roller.

In an embodiment that is advantageous in terms of construction, the at least one actuator element and the swing arm device are connected via a rotational-translational guide, wherein for adjusting a position of the at least one sweeping roller, a pivotal position of or at the swing arm device is adjustable, and a displacement is capable of being performed at the rotational-translational guide upon floor/ground contact of the at least one sweeping roller. This provides a simple way of adjusting a position and also of detecting floor/ground contact.

In particular, the sensor device is then associated with the rotational-translational guide and the sensor device checks for displacement at the rotational-translational guide. This provides a simple way of detecting floor/ground contact, and this in turn provides a simple way of enabling the diameter of the at least one sweeping roller to be determined even as it wears.

Provision may be made for the swing arm device to comprise a lever element which is pivotable relative to the chassis and upon which the adjusting device acts. This provides a simple way of adjusting the position of the at least one sweeping roller relative to the floor/ground to be cleaned and, in particular, of adjusting a sweeping pattern.

In particular, a pivot axis of the lever element is at least approximately parallel to an axis of rotation of the at least one sweeping roller. In this way, surface contact of the at least one sweeping roller with the floor/ground to be cleaned is achieved.

In an exemplary embodiment, the at least one actuator element of the adjusting device is articulated to the lever element and is, in particular, articulated thereto via a rotational-translational guide. This allows a pivoting action to be effected at the swing arm device and, furthermore, floor/ground contact can be detected in a simple manner.

By providing the rotational-translational guide, relative displacement between the at least one actuator element and the lever element can be accomplished in a region of articulation therebetween upon floor/ground contact of the at least one sweeping roller. This displacement in turn can be detected by the sensor device, and, for example, a switch signal can be provided. This permits simple, and in particular non-contact, diameter determination of the at least one sweeping roller.

The sensor device monitors relative displacement between the lever element and the at least one actuator element in the region of articulation therebetween. It is thereby easily possible to effect diameter determination, while minimizing the number of components.

In an embodiment, the rotational-translational guide comprises a receptacle for a connecting element between the at least one actuator element and the lever element, wherein the connecting element is pivotable and displaceable in the receptacle. This provides a simple way of achieving pivoting actuation of the lever element, and therefore of the swing arm device, by way of the actuator element (and, for example, by way of a linear displacement of the actuator element). Furthermore, floor/ground contact of the at least one sweeping roller can be achieved based on the corresponding lifting force.

In an embodiment that is advantageous in terms of manufacture, the receptacle is configured as an elongated hole or comprises one or more elongated holes. This provides a simple way of realizing a rotational-translational guide.

It is advantageous for the connecting element to be spring-biased. For example, a certain lifting force is then necessary for displacement at the rotational-translational guide to occur at all.

Advantageously, a spring device is provided that is articulated to the connecting element and the lever element. Said spring device can be used to facilitate “floating” in the receptacle. In principle, for floating, i.e. displacement of the connecting element in the receptacle, to occur, the full weight force of the sweeping roller must be overcome. By providing a spring device (which comprises in particular one or more tension springs), the force that is required for “floating” to take place can be reduced, i.e. the corresponding force is then less than the weight force of the at least one sweeping roller and corresponds at least approximately to the difference between the weight force of the at least one sweeping roller and the spring force. The spring device thus, in a sense, assists in providing the “floating state” of the at least one sweeping roller. The spring device also achieves a damping effect at least for one or more certain sweeping patterns so that vibrations of the at least one sweeping roller that occur relative to the chassis during operation, can be dampened.

It is advantageous for the rotational-translational guide to have a second stop opposite a first stop, wherein the connecting element, assisted by the spring force of the spring device, is capable of being displaced between the first stop and the second stop upon floor/ground contact of the at least one sweeping roller. The first stop and the second stop delimit the capability for displacement of the connecting element in the receptacle. In particular, the first stop, when it has the connecting element in contact thereagainst, serves to adjust a defined pivotal position of the at least one sweeping roller relative to the chassis. When the at least one sweeping roller makes contact with the floor/ground, the at least one sweeping roller is caused to float, wherein the connecting element is thereby displaceable from the first stop in a direction towards the second stop. The second stop delimits this displacement movement. The movement of the connecting element away from the first stop is capable of being detected. The spring device assists with this movement away from the first stop such that in particular the force required for movement away from the first stop to take place need not be the full weight force of the at least one sweeping roller.

In particular, the sensor device provides a switch signal when the connecting element is positioned at or near the second stop and, in particular, when the connecting element is positioned at one or more certain positions. Said switch signal can be used, in connection with a measured measuring signal for the position of the at least one actuator element, to calculate the diameter of the at least one sweeping roller.

In an embodiment, the swing arm device comprises spaced holders which have the at least one sweeping roller held therebetween. These holders can be pivoted via the swing arm device in order to fix, and in particular to adjustably fix, a position of the at least one sweeping roller relative to the floor/ground to be cleaned.

For example, the holders are located on a rod on which the lever element is arranged. It is thus easily possible, by pivotal positioning of the at least one sweeping roller, to adjust and fix the position thereof relative to the floor/ground to be cleaned.

Preferably, the rod is translationally fixed and pivotable relative to the chassis, wherein a pivoting actuation of the lever element causes pivoting of the rod. This makes for a construction that is simple in structure.

In particular, one or more different sweeping patterns of the at least one sweeping roller are capable of being adjusted. This gives high variability to the surface cleaning machine.

The surface cleaning machine is in particular a sweeping machine and is in particular of self-propelled configuration and is for example configured as a ride-on machine.

In accordance with an embodiment of the invention, a method is provided which can be implemented in a manner that is simple in structure.

In accordance with an embodiment of the invention, the sweeping roller is held on a swing arm device, wherein a pivotal position of or at the swing arm device determines a position of the sweeping roller relative to the floor/ground to be cleaned, a pivotal position at the swing arm device is adjusted via an actuator, floor/ground contact of the sweeping roller is determined at the swing arm device via a sensor device and a position at the actuator is measured upon floor/ground contact of the sweeping roller.

The method in accordance with the invention has the advantages that have been described in connection with the surface cleaning machine constructed in accordance with the invention.

Further advantageous embodiments have likewise already been discussed in connection with the surface cleaning machine constructed in accordance with the invention.

The method in accordance with the invention can be carried out on the surface cleaning machine constructed in accordance with the invention, or the surface cleaning machine constructed in accordance with the invention can be operated using the method in accordance with the invention.

In particular, a diameter of the sweeping roller is calculated from the measured position at the actuator upon floor/ground contact of the sweeping roller. It is thereby possible for the diameter of the sweeping roller to be determined in a simple and, with respect to the sweeping roller, non-contact manner.

In particular, with knowledge of the diameter, a predetermined sweeping pattern is then adjusted via the actuator.

It is advantageous for the sensor device to determine a quantity at the swing arm device that characterizes a lift of the sweeping roller upon floor/ground contact thereof. This provides a simple way of determining a diameter of the sweeping roller even as it wears and without the sweeping roller having to be sensed by feelers or the like.

In particular, relative displacement between the actuator and the swing arm device takes place upon floor/ground contact of the sweeping roller, said relative displacement being detectable by the sensor device. The number of adjusting elements and also the number of sensors can thereby be minimized.

In particular, the actuator is articulated to the swing arm device via a rotational-translational guide, wherein the actuator effects pivotal movement of or at the swing arm device via the rotational guide part of the rotational-translational guide and wherein floor/ground contact of the sweeping roller is detected via the translational part of the rotational-translational guide. This provides a simple way of determining the current diameter of the sweeping roller, and a certain sweeping pattern can be adjusted. The number of adjusting elements and sensors can thereby be minimized.

The following description of preferred embodiments serves in conjunction with the drawings to explain the invention in greater detail.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a schematic side view of an exemplary embodiment of a surface cleaning machine constructed in accordance with the invention;

FIG. 2 illustrates a perspective view of a sweeping roller unit;

FIG. 3 illustrates a view of the sweeping roller unit of FIG. 2, taken in the direction A;

FIG. 4 illustrates a view of the sweeping roller unit of FIG. 2, taken in the direction B;

FIG. 5 illustrates a sectional view along line 5-5 in FIG. 3;

FIG. 6 illustrates a sectional view along 6-6 in FIG. 3;

FIG. 7 is an enlarged view of the detail marked C in FIG. 5; and

FIG. 8 is an enlarged view of the detail marked D in FIG. 6.

DETAILED DESCRIPTION OF THE INVENTION

An exemplary embodiment of a surface cleaning machine 10, shown in side view in FIG. 1, is a sweeping machine. The surface cleaning machine 10 (sweeping machine 10) comprises a chassis 12.

In an exemplary embodiment, the surface cleaning machine 10 is configured as a ride-on machine. To this end, the chassis 12 has arranged thereon a seat 14 for an operator.

The surface cleaning machine 10 comprises a housing 16 which is arranged on the chassis 12. Positioned in the housing 16 is a suction fan device 18.

The surface cleaning machine 10 comprises a sweeping roller 20 which is positioned in a sweeping roller housing 22. The sweeping roller housing 22 including the sweeping roller 20 is arranged in a lower region of the housing 16 relative to the direction of gravity.

The sweeping roller 20 is capable of rotating about an axis of rotation 24, wherein a corresponding rotary drive is provided. The sweeping roller 20 is capable of being brought into contact with a floor/ground 26 to be cleaned. The axis of rotation 24 is parallel to the floor/ground 26 (when on flat floor/ground 26). When the floor/ground 26 on which the surface cleaning machine 10 stands up is oriented horizontally, then the axis of rotation 24 will be oriented horizontally.

The axis of rotation 24 is perpendicular to the drawing plane in FIG. 1.

The drive of the sweeping roller 20 (not visible in FIG. 1) is for example an electric motor or a combustion engine.

Furthermore, the surface cleaning machine 10 has a drive for a travelling movement. In particular, the surface cleaning machine 10 is of a self-propelled configuration. The motor for the propelling drive can be a combustion engine or an electric motor.

Provision may be made for the motor for the propelling drive to provide also the rotary drive for the sweeping roller 20.

In an exemplary embodiment, the surface cleaning machine 10 also comprises disk brushes 28, 30 which are held on the chassis 12, in a position beneath said chassis 12. The disk brushes 28, 30 each have a corresponding rotary drive associated therewith. A corresponding rotary axis is transverse to the floor/ground 26.

The sweeping machine 10 comprises a debris container 32. Said debris container 32 is arranged on or in the housing 16 and is in particular detachably held on a housing lower part. The debris container 32 serves to receive coarse debris that has been picked up by the sweeping roller 22 from the floor/ground 26 being cleaned.

Extending within the housing lower part is a suction channel 34 which is operatively connected for fluid communication with an interior space 36 of the sweeping roller housing 22. The suction channel 34 starts from said interior space 36 and extends to a suction channel opening 38 of the housing lower part. Arranged at the suction channel opening 38 is a filter device 40 having one or more filters, in particular filters of the flat pleated type. The suction fan device 18 is operatively connected for fluid communication with a clean side 44 of the filter device 40 via a suction conduit 42.

In an exemplary embodiment, the filter device 40 has associated with it a cleaning device 46 for filter cleaning. In this respect, reference is made to WO 2001/095591 A1, which is incorporated herein and made a part hereof by reference in its entirety and for all purposes.

Extending between the suction channel 34 and the suction conduit 42 is a partition wall 48 which forms a channel wall of the suction channel 34.

Debris, indicated by the reference numeral 50 in FIG. 1, is sucked through the suction channel 34 by the action of a suction flow created by the suction fan device 18, and the corresponding suction flow passes through the filter device 40.

The surface cleaning machine 10 has a wheel device generally designated 52; visible in FIG. 1 is a front wheel by which the surface cleaning machine 10 is supported, via the chassis 12 thereof, on the floor/ground 26.

The surface cleaning machine 10 has a sweeping roller unit 54 including the sweeping roller 20 and the sweeping roller housing 22.

An exemplary embodiment of a sweeping roller unit 54 constructed in accordance with the invention and shown in FIGS. 2 to 8 comprises the sweeping roller housing 22. The sweeping roller housing 22 has opposing end walls 56 a, 56 b. The end walls 56 a, 56 b are, in principle, of identical configuration and they each have, for example, three edges comprising a first edge 58 a, a second edge 58 b and a third edge 58 c. The first edge 58 a and the second edge 58 b meet. The second edge 58 b and the third edge 58 c meet. The first edge 58 a and the third edge 58 c also meet.

Located between the opposing first edges 58 a of the end walls 56 a, 56 b is a first cover wall 60 which has an opening to the suction channel 34 (not visible in the figures). Located between the respective second edges 58 b of the end walls 56 a, 56 b is a second cover wall 62, which is closed. The first cover wall 60 extends to the third edge 58 c. Furthermore, the second cover wall 62 extends to the third edge 58 c.

The interior space 36 is open in a downward direction between the third edges 58 c of the end walls 56 a, 56 b, so that the sweeping roller 20 can act upon the floor/ground 26 that is to be cleaned.

Arranged on the third edges 58 c is a contact element 64 for contact against the floor/ground 26 being cleaned. Said contact element 64 is in particular made of an elastic material, such as a rubber material, and is for example movably arranged and/or movably configured such that an interspace between the third edge 58 c and the floor/ground 26 is covered thereby.

The sweeping roller 20 is held on the chassis 12 via a swing arm device 66. The swing arm device 66 permits positional adjustment of the sweeping roller 20 and permits in particular adjustment of a height position of the sweeping roller 20 relative to the chassis 12 and, therefore, relative to the floor/ground 26.

A pivotal movement is capable of being performed at the swing arm device 66 in order to enable adjustment of the position of the sweeping roller 20 relative to the floor/ground 26.

The swing arm device 66 comprises a first holder 68 a and a spaced second holder 68 b. The first holder 68 a and the second holder 68 b are in principle of identical configuration relative to one another. In each case the end walls 56 a, 56 b have openings 70 formed thereon. In each case the openings 70 have articulation elements 72 positioned therethrough, located on the respective holders 68 a and 68 b. The articulation elements 72 in turn are fixed to the sweeping roller 20 on both sides thereof. The sweeping roller 20 is held on opposing sides thereof in the interior space 36 of the sweeping roller housing 22 by way of the first holder 68 a and the second holder 68 b, wherein the first holder 68 a and the second holder 68 b are positioned exteriorly of said interior space 36. The openings 70 are configured such that they permit pivotal movement of the holders 68 a and 68 b which permits height adjustment of the sweeping roller 20 relative to the floor/ground 26.

The first holder 68 a and the second holder 68 b are connected together via a rod 74. The rod 74 faces towards the second cover wall 62 and is spaced apart therefrom. In an exemplary embodiment, the first holder 68 a and the second holder 68 b are connected to the rod 74 in rotationally fixed relationship therewith.

The rod 74 is pivotally supported in spaced pivot bearings 76 a, 76 b. The pivot bearings 76 a, 76 b are positioned on or relative to the chassis 12 in translationally fixed and rotationally fixed relation therewith. As a result, the rod 74 is also translationally fixed with respect to the chassis 12. Pivoting of the rod 74 causes the first holder 68 a and the second holder 68 b to pivot in unison relative to the chassis 12 and relative to the end walls 56 a, 56 b. The relative height position of the sweeping roller 20 relative to the floor/ground 26 can thereby be adjusted.

The pivot bearings 76 a, 76 b are positioned in the proximity of the end walls 56 a and 56 b respectively.

In particular, a pivot axis 77 of the rod 74 is located at least approximately parallel to the axis of rotation 24 of the sweeping roller 20.

On the rod 74, in a central area thereof, is a lever element 78. The lever element 78 extends transversely and for example perpendicularly to the pivot axis 77. The lever element 78 is located on the rod 74 in rotationally fixed relationship therewith.

An adjusting device 80 is provided for adjusting a certain position of the sweeping roller 20 relative to the floor/ground 26. The adjusting device 80 is located above the second cover wall 62 and is fixed to the sweeping roller housing 22.

In an exemplary embodiment, the adjusting device comprises an actuator 82 having an actuator element 84. The actuator element 84 is linearly displaceable in a direction/counter-direction 86 which is transverse, and is in particular perpendicular, to the pivot axis 77.

The actuator 82 comprises a drive, for example an electromotive drive, for displacing the actuator element 84.

The actuator element 84 in turn is articulated to the lever element 78. A point of articulation 88 of the actuator element 84 to the lever element 78 is opposite (is spaced apart from) a fixing point 90 via which the lever element 78 is connected to the rod 74.

A displacement position at the actuator 82, and in particular a position of the actuator element 84, is capable of being determined by way of a position measuring device 92 associated with the actuator 82. The position measuring device 92 determines the path and/or position of the actuator element 84 with respect to a starting position.

By way of example, the position measuring device 92 is configured in the form of a potentiometer. In particular, the position measuring device 92 permits an absolute position of the actuator element 84 relative to the starting position to be determined.

The actuator element 84 is connected to the lever element 78 via a rotational-translational guide 94. A connecting element 96 is provided for this connection, said connecting element 96 being configured in the form of a pin. The connecting element 96 is fixedly arranged on the actuator element 84 and is in particular arranged thereon in rotationally fixed relationship therewith. It extends transversely to the direction/counter-direction 86 and extends both left and right from the actuator element.

The lever element 78 is of fork-shaped configuration in the area of the point of articulation 88 and has a receptacle 98 (FIGS. 7 and 8) for the connecting element 96.

In an exemplary embodiment, the receptacle 98 comprises opposing openings 100 formed on spaced lugs 102 a, 102 b in the fork-shaped area of the lever element 78. A portion of the actuator element 84 is positioned in an interspace 104 between the lugs 102 a, 102 b.

The receptacle 98 or the openings 100 thereof is or are configured as an elongated hole which permits relative pivotability between the lever element 78 and the actuator element 84 as well as relative displaceability therebetween.

The receptacle including its openings 100 defines a first stop 106 (FIGS. 7 and 8). Said first stop 106 is formed by a boundary wall of the receptacle 98 or the openings 100. A second stop 108 is formed oppositely to the first stop, said second stop 108 being formed by a boundary wall. The first stop 106 and the second stop 108 are stops for the connecting element 96 in the receptacle 98. The first stop 106 has a larger distance from a fixing point of the adjusting device 80 on the sweeping roller housing 22 than the second stop 108.

Arranged on the lever element 78 is a holder 110 for a spring device 112. The holder extends left and right from the lever element 78. It holds a first spring 114 a and a second spring 114 b, wherein the first spring 114 a and the second spring 114 b are spaced apart and have the actuator element 84 interposed between them. The springs 114 a and 114 b of the spring device 112 are fixed to the connecting element 96.

The springs 114 a, 114 b of the spring device 112 are configured as tension springs. They exert a tension force on the connecting element 96 and reduce the force that is required for the connecting element 96 to undergo a displacement movement. The force required for the sweeping roller 20 to “float” is then less than the weight force of the sweeping roller 20. Under ideal conditions (not considering frictional forces), said force required is the difference between the weight force of the sweeping roller 20 and the spring force.

In a stop position of the connecting element 96 against the first stop 106 in the receptacle 98, by moving the actuator element 84 in the direction or counter-direction 86 a, a pivoting actuation of the lever element 78 is achieved and also a certain pivotal position is fixed. A pivot axis 116 which is defined by a capability for rotation of the connecting element 96 in the receptacle 98 is parallel to the pivot axis 77 of the rod 74. The pivoting actuation of the lever element 78 in turn causes pivoting actuation of the rod 74 and therefore of the holders 68 a, 68 b, and this in turn effects pivoting actuation of the sweeping roller 20. A certain pivotal position, and hence height position, of the sweeping roller 20 relative to the floor/ground 26 can thereby be adjusted.

In order to provide pivoting actuation of the lever element 78 via a linear movement of the actuator element 84, the connecting element 96 and/or the receptacle 98 are/is provided with a driver device 118. In an exemplary embodiment, the driver device 118 is formed by the connecting element 96 being in cross-section a polygon (and not a circle) so that the connecting element 96 cannot turn freely in the rotational-translational guide 94.

The connecting element is also displaceable in the rotational-translational guide 94; it is displaceable between the first stop 106 and the second stop 108.

When the sweeping roller 20 comes into contact with the floor/ground 26, the sweeping roller 20 experiences a lifting force which is transmitted via the swing arm device 66. This lifting force causes movement of the lever element 78 such that the connecting element 96 is moved away from the first stop 106. The second stop 108 serves to stop this movement.

By monitoring as to whether the connecting element is moved away from the first stop 106, and in particular by monitoring as to whether the connecting element 96 strikes the second stop 108, it is possible to check as to whether or not the sweeping roller 20 is in contact with the floor/ground.

Associated with the swing arm device 66 is a sensor device 120 which is capable of detecting floor/ground contact of the sweeping roller 20. The sensor device 120 monitors a movement and monitors in particular a displacement movement between the lever element 78 and the connecting element 96 at the rotational-translational guide 94.

In an exemplary embodiment, the sensor device 120 comprises a switch and comprises in particular a microswitch 122 which is located on the lever element 78 in the area of the point of articulation 88. It is in principle possible for each lug 102 a, 102 b to carry a switch 122 of its own or, alternatively, only one single switch 122 is arranged on, for example, the lug 102 a.

The sensor device comprises a movable element 124 (FIGS. 7 and 8) which makes contact against the connecting element 96 and is for example spring-biased. Displacement of the connecting element 96 in the rotational-translational guide 94 causes the element 124 to co-move therewith.

FIGS. 7 and 8 depict a position in which the sensor device 120 or the microswitch 122 does not output a switch signal.

A switch signal is generated when, in response to relative displacement of the connecting element 96 in the receptacle 98, the element 124 co-moves and is then located in a certain position relative to the sensor device 120. The certain position is for example defined by the connecting element 96 striking the second stop 108 or by a certain position of the connecting element 96 in the rotational-translational guide 94 away from the first stop 106.

Thus, the sensor device 120 monitors whether or not the sweeping roller 20 is in contact with the floor/ground 26. If it is, the sensor device 120 outputs a corresponding signal and outputs in particular a switch signal that is usable.

The movement of the connecting element 96 away from the first stop 106 and in a direction towards the second stop 108 is assisted by the spring force provided by the spring device 112.

The surface cleaning machine 10 comprises a control device 126 (FIG. 4) for controlling the position of the sweeping roller 20 relative to the floor/ground 26 to be cleaned (and, therefore, also relative to the chassis 12). In particular, the control device 126 is integrated in a general control of the surface cleaning machine 10 for sweep mode and travel mode operation thereof.

The control device 126 is operatively connected for signal communication with the sensor device 120; the latter provides its sensor signals, and in particular its switch signals, to the control device 126. Furthermore, the sensor device 120 is operatively connected for signal communication with the position measuring device 92. The position measuring device 92 provides its measurement signals to the control device 126.

Furthermore, the control device 126 controls the actuator 82 for adjusting a certain displacement position of the actuator element 84.

The control device has a diameter determining device 128. By use of the diameter determining device 128, the diameter of the sweeping roller 20 can be determined. The sweeping roller 20 has brushes or similar tools which will wear in normal operation of the surface cleaning machine 10. The diameter of the sweeping roller 20 is thereby reduced.

The position of the sweeping roller 20 relative to the floor/ground 26 is adjusted via the position of the actuator element 84. The pivotal position of the rod 74 and, therefore, of the holders 68 a, 68 b relative to the chassis 12 is adjusted.

For example when, upon actuation of the actuator 82, the sweeping roller 20 is moved in a direction towards the floor/ground 26 and then contacts the floor/ground 26, the sensor device 120 will then, upon floor/ground contact, provide a corresponding switch signal to the diameter determining device 128. At the time of receiving the switch signal, the diameter determining device 128 determines the measured position of the actuator element 84 based on the data from the position measuring device 92. The diameter of the sweeping roller 20 can thereby be calculated. To this end, for example, when a new sweeping roller 20 is installed, a relationship between the position of the sweeping roller 20 and the diameter thereof is established, and this initial relationship can then be used for diameter determination even during sweeping roller wear without the need for a further sensor.

In an exemplary embodiment, the control device 126 comprises an annunciating device 130 which is associated with the diameter determining device 128. For example, when the determined diameter is below a certain threshold value, then the annunciating device 130 will send a corresponding annunciating signal, in particular a warning signal, to the operator of the surface cleaning machine 10. This annunciating signal is in particular a warning signal alerting the operator that a new sweeping roller 20 needs to be installed because of excessive wear.

The surface cleaning machine 10 constructed in accordance with the invention works as follows.

In operation of the surface cleaning machine 10, the sweeping roller 20 is brought into contact with the floor/ground 26 to be cleaned. A sweeping pattern is a measure of a working area of the sweeping roller 20 in which the latter is in contact with the floor/ground 26 to be cleaned. Different sweeping patterns may be adequate for different cleaning processes or different floor/ground conditions.

Different sweeping patterns can be adjusted, and can in particular be adjusted automatically, via the sweeping roller unit 54.

Via the swing arm device 66, the sweeping roller 20 is held on the chassis 12 and the position of the sweeping roller 20 relative to the floor/ground 26, and hence the sweeping pattern, can be adjusted. When the sweeping roller 20 contacts the floor/ground 26, the sensor device 120 provides a corresponding signal so that the diameter can be determined. Using this known diameter it is then possible, by corresponding actuator actuation of the actuator 82, for the sweeping pattern to be adjusted in a defined manner and also for it to be adapted.

By evaluating the position of the actuator element 84 in connection with a corresponding signal from the sensor device 120, the sweeping roller diameter can be determined and different sweeping programs (sweeping patterns) can be adjusted by corresponding positioning via the actuator element 84.

In the solution in accordance with the invention, the number of adjusting elements and sensor elements or switching elements is minimized. The actuator 82 including the actuator element 84 and the position measuring device 92 are sufficient as an adjusting element. The switching element which serves for diameter determination is realized by the sensor device 120 and reacts to a quantity that is characteristic of a lifting force of the sweeping roller 20 upon contact with the floor/ground 26.

The diameter of the sweeping roller 20 is determined in a non-contact manner so that there is minimal interference with the sweeping operation. There is no need to locate control button zones or the like in an area of the surface cleaning machine 10 that is exposed to heavy mechanical loading and dirt loading.

In principle, the relationship between diameter of the sweeping roller 20 and position of the actuator element 84 is determined with the sweeping roller 20 in “new condition”. It is then possible for the diameter of the corresponding sweeping roller 20 to be determined even as it wears.

In principle, the sweeping pattern can also be adjusted automatically by monitoring via the sensor device 120 a quantity that characterizes the lifting force of the sweeping roller 20.

In the solution in accordance with the invention, displacement of the connecting element 96 in the receptacle 98 characterizes the sweeping roller 20 coming into contact with the floor/ground 26. This action of the sweeping roller 20 coming into contact with the floor/ground is detected by the sensor device 120 via displacement of the connecting element 96 in the receptacle 98. In principle, for such a displacement to take place, the weight force of the sweeping roller 20 needs to be overcome. The spring device 112 is configured in such a way that it assists in “floating” the sweeping roller 20, which results in displacement of the connecting element 96 in the receptacle 98 away from the first stop 106.

If, for example, the sweeping roller 20 has a mass of 16 kilograms, then a lifting force of approximately 160 N is needed for such a displacement to take place. The spring device 112 is for example adjusted to provide an assisting force of approximately 100 N. Under these conditions, only a lifting force of approximately 60 N is then needed to establish the “floating state” with displacement of the connecting element 96 in the receptacle 98.

The spring device 112 also has a damping effect on vibrations of the swing arm device 66 and sweeping roller 20 relative to the chassis.

In an exemplary embodiment, a first sweeping pattern, a second sweeping pattern and a third sweeping pattern are provided for the surface cleaning machine 10, wherein the first sweeping pattern is smaller (has a smaller contact area) than the second sweeping pattern and the second sweeping pattern is smaller that the third sweeping pattern.

For example, a contact width (contact area divided by the length of the sweeping roller 20) of approximately 30 mm is provided in the first sweeping pattern. For the first sweeping pattern, the sweeping roller 20 can be slightly lifted via the swing arm device 66.

When operating with the second sweeping pattern and the third sweeping pattern, the sweeping roller 20 is pushed against the floor/ground 26 via the swing arm device 66, wherein these two cases are different quantitatively.

In particular, the spring device 112 is adjusted in such a way that, when in the second sweeping pattern, the sweeping roller 20 can to some extent still follow the contours of uneven ground surfaces.

REFERENCE SYMBOL LIST

-   10 surface cleaning machine -   12 chassis -   14 seat -   16 housing -   18 suction fan device -   20 sweeping roller -   22 sweeping roller housing -   24 axis of rotation -   26 floor/ground -   28 disk brush -   30 disk brush -   32 debris container -   34 suction channel -   36 interior space -   38 suction channel opening -   40 filter device -   42 suction conduit -   44 clean side -   46 filter cleaning device -   48 partition wall -   50 debris -   52 wheel device -   54 sweeping roller unit -   56 a end face -   56 b end face -   58 a first edge -   58 b second edge -   58 c third edge -   60 first cover wall -   62 second cover wall -   64 contact element -   66 swing arm device -   68 a first holder -   68 b second holder -   70 opening -   72 articulation element -   74 rod -   76 a pivot bearing -   76 b pivot bearing -   77 pivot axis -   78 lever element -   80 adjusting device -   82 actuator -   84 actuator element -   86 direction/counter-direction -   88 point of articulation -   90 fixation point -   92 position measuring device -   94 rotational-translational guide -   96 connecting element -   98 receptacle -   100 opening -   102 a lug -   102 b lug -   104 interspace -   106 first stop -   108 second stop -   110 holder -   112 spring device -   114 a first spring -   114 b second spring -   116 pivot axis -   118 driver device -   120 sensor device -   122 switch -   124 element -   126 control device -   128 diameter determining device -   130 annunciating device 

1. A surface cleaning machine, comprising: a chassis; at least one sweeping roller which is held on the chassis; an adjusting device for adjusting a position of the at least one sweeping roller relative to a floor/ground to be cleaned; a sensor device which determines one or more quantities characterizing the relative position of the at least one sweeping roller to the floor/ground to be cleaned; and a control device which controls the relative position of the at least one sweeping roller to the floor/ground to be cleaned; wherein the at least one sweeping roller is held on the chassis via a swing arm device; wherein the adjusting device acts on the swing arm device, wherein a position of the at least one sweeping roller relative to the floor/ground to be cleaned is adjusted via a pivotal position of or at the swing arm device; and wherein the sensor device is associated with the swing arm device and detects floor/ground contact of the at least one sweeping roller via the swing arm device.
 2. The surface cleaning machine in accordance with claim 1, wherein the at least one sweeping roller is associated with a rotary drive for operation thereof in a sweep mode.
 3. The surface cleaning machine in accordance with claim 1, wherein the at least one sweeping roller is held on the chassis for pivotal motion about a pivot axis.
 4. The surface cleaning machine in accordance with claim 1, wherein a sweeping roller housing is arranged on the chassis, said sweeping roller housing being open towards the floor/ground to be cleaned and having the at least one sweeping roller positioned therein.
 5. The surface cleaning machine in accordance with claim 4, wherein the adjusting device is at least one of (i) fixed to and (ii) supported on the sweeping roller housing.
 6. The surface cleaning machine in accordance with claim 4, wherein the sweeping roller housing has, at opposing end faces thereof, openings through which articulation elements of the swing arm device extend and hold the at least one sweeping roller.
 7. The surface cleaning machine in accordance with claim 1, wherein the adjusting device comprises an actuator having at least one movable actuator element, said actuator element being articulated to the swing arm device.
 8. The surface cleaning machine in accordance with claim 7, wherein the at least one actuator element is linearly displaceable.
 9. The surface cleaning machine in accordance with claim 7, wherein the actuator has associated with it a position measuring device which determines a position of the at least one actuator element.
 10. The surface cleaning machine in accordance with claim 9, wherein the control device comprises a diameter determining device for the at least one sweeping roller which, by way of a position at the actuator measured by the position measuring device, determines the diameter of the at least one sweeping roller upon floor/ground contact thereof.
 11. The surface cleaning machine in accordance with claim 10, wherein the control device comprises an annunciating device which provides an annunciating signal when the determined diameter of the at least one sweeping roller is below a threshold value.
 12. The surface cleaning machine in accordance with claim 1, wherein the sensor device is or comprises a switch which provides a switch signal upon floor/ground contact of the at least one sweeping roller.
 13. The surface cleaning machine in accordance with claim 7, wherein the at least one actuator element and the swing arm device are connected via a rotational-translational guide, wherein for adjusting a position of the at least one sweeping roller, a pivotal position of or at the swing arm device is adjustable, and a displacement is capable of being performed at the rotational-translational guide upon floor/ground contact of the at least one sweeping roller.
 14. The surface cleaning machine in accordance with claim 13, wherein the sensor device is associated with the rotational-translational guide and checks for displacement at the rotational-translational guide.
 15. The surface cleaning machine in accordance with claim 1, wherein the swing arm device comprises a lever element which is pivotable relative to the chassis and upon which the adjusting device acts.
 16. The surface cleaning machine in accordance with claim 15, wherein a pivot axis of the lever element is at least approximately parallel to an axis of rotation of the at least one sweeping roller.
 17. The surface cleaning machine in accordance with claim 16, wherein the at least one actuator element of the adjusting device is articulated to the lever element.
 18. The surface cleaning machine in accordance with claim 17, wherein relative displacement between the at least one actuator element and the lever element is capable of being performed in a region of articulation therebetween upon floor/ground contact of the at least one sweeping roller.
 19. The surface cleaning machine in accordance with claim 18, wherein the sensor device monitors relative displacement between the lever element and the at least one actuator element in the region of articulation therebetween.
 20. The surface cleaning machine in accordance with claim 17, wherein the rotational-translational guide comprises a receptacle for a connecting element between the at least one actuator element and the lever element, wherein the connecting element is relatively pivotable and displaceable in the receptacle.
 21. The surface cleaning machine in accordance with claim 20, wherein the receptacle is configured as an elongated hole or comprises one or more elongated holes.
 22. The surface cleaning machine in accordance with claim 20, wherein the connecting element is spring-biased.
 23. The surface cleaning machine in accordance with claim 22, wherein a spring device is provided which is articulated to the connecting element and the lever element.
 24. The surface cleaning machine in accordance with claim 23, wherein the rotational-translational guide has a second stop opposite a first stop, wherein the connecting element, assisted by the spring force of the spring device, is displaceable between the first stop and the second stop upon floor/ground contact of the at least one sweeping roller.
 25. The surface cleaning machine in accordance with claim 24, wherein the sensor device provides a switch signal when the connecting element is positioned at or near the second stop.
 26. The surface cleaning machine in accordance with claim 1, wherein the swing arm device comprises spaced holders which have the at least one sweeping roller held therebetween.
 27. The surface cleaning machine in accordance with claim 26, wherein the holders are located on a rod on which the lever element is arranged.
 28. The surface cleaning machine in accordance with claim 27, wherein the rod is translationally fixed and pivotable relative to the chassis, wherein a pivoting actuation of the lever element causes pivoting of the rod.
 29. The surface cleaning machine in accordance with claim 1, wherein a capability for adjusting one or more different sweeping patterns of the at least one sweeping roller is provided.
 30. The surface cleaning machine in accordance with claim 1, wherein the surface cleaning machine is of self-propelled configuration.
 31. A method for adjusting the position of a sweeping roller in a surface cleaning machine, comprising: holding the sweeping roller on a swing arm device, wherein a pivotal position of or at the swing arm device determines a position of the sweeping roller relative to the floor/ground to be cleaned; adjusting a pivotal position at the swing arm device via an actuator; determining floor/ground contact of the sweeping roller at the swing arm device via a sensor device; and measuring a position at the actuator upon floor/ground contact of the sweeping roller.
 32. The method in accordance with claim 31, wherein a diameter of the sweeping roller is calculated from the measured position at the actuator upon floor/ground contact of the sweeping roller.
 33. The method in accordance with claim 32, wherein, with knowledge of the diameter, a predetermined sweeping pattern is adjusted via the actuator.
 34. The method in accordance with claim 31, wherein the sensor device determines a quantity at the swing arm device that characterizes a lift of the sweeping roller upon floor/ground contact thereof.
 35. The method in accordance with claim 31, wherein relative displacement between the actuator and the swing arm device takes place upon floor/ground contact of the sweeping roller, said relative displacement being detectable by the sensor device.
 36. The method in accordance with claim 31, wherein the actuator is articulated to the swing arm device via a rotational-translational guide, wherein the actuator effects pivotal movement of or at the swing arm device via the rotational guide part of the rotational-translational guide and wherein floor/ground contact of the sweeping roller is detected via the translational part of the rotational-translational guide. 